Of course, especially now that NASA is hitching rides from the Russians. We could answer a lot about the nature and state of the universe and life by looking under the surface. The hydrothermal vents in the Marianas Trench may hold the key to understanding how life first evolved here. Also, the same phenomenon may be taking place in Antarctica's Lake Vostok. No need to go to Europa or Titan if we can simulate the environment here on Earth.